Lingual bar



L. J. WEINSTEINI LINGUAL BAR. APPLICATION FILED MAY 5, 1921.

Patented Oct. 31, 1922.

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rrsn stares ra'rsur LOUIS J. WEINSTEIN, OF NEW YORK, N. 'Y., ASSIGNOR TO THE 8'. M. NEY COMPANY, OF HARTFORD, CONNECTICUT.

LINGUAL BAR.

Application filed May 5, 1921.

To all whom it may concern:

Be it known that 1, Louis J. l/VniNs'rmN, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Lingual Bars of which the following is a specification.

My invention relates to dental apparatus and specifically to such known as lingual bars. which are used in the construction of partial dentures, particularly for the lower jaw.

l am aware that such bars have been used in the construction of partial dentures, haw ing either been made by the dental operator or provided ready for use. As compared with those heretofore used, the advantages of my new lingual bar consist in that it is provided with specially formed retentive surfaces to be embedded in the vulcanite of the denture. and is of such form as to be more readily and suitably adapted to oral conditions.

Referring to the drawings: Fig. 1 is a front elevation of the developed bar. i

Fig. is a top plan of the shaped bar. Fig. 3 is a front elevation thereof. Fig. i is a view on 4L-1 of Fig. 3. Figs. 5 and 6 are top plans of bars having arms of unequal length.

l ig. 7 is a top plan and Fig. 8 a rear ele vation of a lower partial denture showing the use of my new lingual bar.

suitable metal or alloy, is provided at each end for a certain portion of its length with a specially formed retentive surface 11, to be inserted in the vulcanite portions i l of a partial denture, and with an offset 12 located at a point between the ends of bar 10, which offset 12 is substantially perpendicular with respect to the remainder of the lingual bar.

In the construction of partial dentures, whether these be made entirely of vulcanite or of vulcanite in combination with a lingual bar, for example of metal, it is invariably necessary to have an offset portion to proride space for the play of the lingual frenuni,

since otherwise this mobile tissue would suf- The bar 10, for example, of gold or other Serial No. 467,086.

ferinjury or interfere with the efficiency of the denture.

In addition to forming my lingual bars of dimensions varying according to those of different dental arches, I have constructed such bars with arms of, unequal length, such as 15 and 16, the advantage therein residing in the facility of displacing or adjusting the offset 12 of the bar 10 with respect to the length thereof and the location of the lingual frenum, as explained hereinafter.

As illustrated on Fig. i, the lingual bar 10 is approximately Oval lenticular in cross section, the offset 12 extending in the same general direction as the longer axis of said cross section; it is hence often difiicult and impossible to adjust or shift the offset 12 according to requirements, that is, to bend the bar along the longer axis of its cross section, as shown at 10 of Fig. 4. By spreading out or developing the bar as in Fig. 1, and bending it along the shorter cross section 10, Fig. 1, the offset 12 may be adapted to any portion of the arch, and the remainder of the bar shaped accordingly. This is of especial advantage in the construction, for example,,of a partial lower denture such as illustrated in Figs. 7 and 8, in which all the posterior teeth are missing on one side and only one. for example, on the other. a natural tooth or teeeth being posterior thereto. It is evident that with a lingual bar of dimensions corresponding to the whole arch, a portion of the retentive surface provided for the shorter end of the denture would have to be removed from the bar 10, and since this retentive surface is of peculiar construction and one that can not be formed by the dental operator, the effect thereof would be lost. There is, hence, an especial advantage in making use of one of the unequally armed lingual bars shown on Figs. 5 and 6, in which, after the offset 12 is adjust-ed to the position desired in the con-. struction of a denture of unequal lateral dimensions, the retentive surfaces are not disturbed.

' The retentive surface 11 isof novel construction, and is formed of a series of staggered indentations on both sides of the bar, ing of unequal length, the ends of each arm rendering its removal from the vulcanized portion being provided with retentive 10 base in which it is embedded extremely diflicrooked surfaces adapted to be embeddedand cult. retained in vuleanite saddle portions of the I claim: artificial denture.

A lingual bar for artificial dentures eom- In testimony whereof I afiix my signature. prising a curved portion and arm portions extending therefrom, said arm portions be- LOUIS J. WEINSTEIN. 

